"Hate speech is not protected by the first amendment," Dean tweeted Thursday.

His tweet came in response to a former New York Times reporter who tweeted a quote from conservative commentator Ann Coulter, who allegedly once said that her "only regret" with Oklahoma City bomber Timothy McVeigh is that "he did not go to the New York Times building."

Of course, the U.S. Constitution's First Amendment protects the rights of free speech, religious freedom, press rights, petition rights and assembly rights with very minor and small restrictions.

Still, that didn't stop Dean from doubling down on his comments Friday, where he argued that a Supreme Court case from 1942 â�� Chaplinsky v. New Hampshire â�� proves the First Amendment doesn't protect "hate speech."

That case, which established the "fighting words doctrine," found that "some forms of expressionâ��among them obscenity and fighting wordsâ��do not convey ideas and thus are not subject to First Amendment protection. In this case, Chaplinsky uttered fighting words, i.e., words that 'inflict injury or tend to incite an immediate breach of the peace,'" according to Oyez.com.

The court case, however, didn't address "hate speech" like Dean claims and Twitter was quick to inform him of this fact, many of them lawyers and legal experts.

@GovHowardDean I'm a First Amendment lawyer. Your reliance on Chaplinsky is misplaced.